Once installed and activated, the Add-ons tab will become active. To get to the Add-ons tab, click on a form to edit from the All Forms list. The Add-ons tab is listed after the Rules tab.
Before you can start collecting payments, you must enable the add-on for a form. To enable the add-on, check the “Enable payments for this form” box. This will reveal several settings for you to configure.
Currently, the only merchant available is PayPal Standard. See the PayPal Settings documentation for configuration details.
See the Assigning Prices documentation for configuration details.